Armed vigilantes on motorcycles attacked anti-government demonstrators in Venezuela on Wednesday, setting off a stampede by firing into crowds as the biggest protest against President Nicolas Maduro's year-old administration turned violent. Three people were killed.

Chaos erupted in downtown Caracas when the gang roared up and began shooting at more than 100 protesters who had been sparring with security forces at the tail end of heated but otherwise peaceful protests organized by hard-line members of the opposition. Most of the roughly 10,000 participants in the demonstrations had already gone home.

As people fled in panic, one demonstrator fell to the ground with a bullet wound in his head. Onlookers screamed "assassins" as they rushed the 24-year-old marketing student to a police vehicle. He was later identified by family members as Bassil Da Costa.